ReaperOfVeriod
36641b4cf8
Adds gc-formats::tfrag and a gated real-disc test that decodes every terrain patch on all 27 levels. Two rules decide whether this works at all, and both were wrong on the first attempt: The vector format is encoded in the VIF command byte, not the immediate. Bits 2-3 are vn (component count minus one) and bits 0-1 are vl, giving element_size = ((32 >> vl) * (vn + 1)) / 8. Terrain positions are vn=2, vl=1 (command 0x69) at 6 bytes. Reading the format from the immediate's low nibble -- the more commonly quoted layout -- yields 12 or 16 bytes and misaligns everything after it. Unpack payloads pad to 4 bytes, and several non-unpack commands carry inline data: STROW/STCOL 16, STMASK 4, MPG num*8, DIRECT/DIRECTHL imm*16. Ignoring those desynchronises the walk, and a desynchronised walk still finds code words that look like positions. Positions are also not all in one list. vert_count is the total across three tiers, the LOD-2 list precedes the common one in offset order, and the LOD-0-only list starts at shared_ofs + lod_1_size*16 rather than at an offset of its own. Scanning only the common list matches about a quarter of patches, each exactly -- which is what made it convincing. The invariant is that every patch yields exactly its own vert_count. It caught both errors, so tfrag_positions returns None on a mismatch rather than partial geometry. All 27 levels: 18,102 patches, 821,439 vertices, zero mismatches. Still open: strips, triangle indices and the RGBA vertex-info arrays. Positions alone are not drawable.
Going Commando
A native PC reimplementation of Ratchet & Clank: Going Commando (PlayStation 2, 2003), written in Rust.
The game is reimplemented, not emulated. There is no MIPS interpreter here and no CPU emulator: the systems are ported to Rust so they run as ordinary native code.
Status: initial scaffold. The disc is identified and verified, the
workspace builds, and nothing else is implemented yet. See
docs/roadmap.md for where things stand and what comes next.
The target
| Game | Ratchet & Clank: Going Commando |
| Platform | PlayStation 2 |
| Disc | SCUS_972.68 v1.01, USA Black Label |
| Video | NTSC, 60 Hz |
| Boot ELF SHA-1 | bacda860cbd6723142e86db56f197e47e728970f |
Verified against a real disc — see docs/disc-identification.md.
This is the build the reference projects pin; Greatest Hits v2.00 is a
different binary and is not the target.
No game content
This repository contains no game assets, no disc images, no BIOS dumps and no proprietary toolchains. You supply your own legally obtained copy of the disc as an input, the way the upstream reference projects do.
A pre-commit hook enforces this, blocking disc images, asset directories, container signatures and files over 50 MiB. If you clone elsewhere, enable it:
git config core.hooksPath .githooks
Layout
crates/
gc-formats/ asset format parsers (pure, no I/O beyond the caller's buffer)
gc-extract/ disc pipeline: identify, unpack, verify
gc-game/ game logic: hero, weapons, moby classes, progression, saves
gc-video/ IPU / MPEG-2 decode
gc-engine/ Bevy app: Graphics Synthesizer, VU0/VU1, renderer, frame loop
docs/
disc-identification.md which disc we build against, verified
roadmap.md phases, gates, current status
plan/ one file per subsystem, written as work proceeds
formats/ format specs, written as formats are reversed
tools/
identify-disc.py identify any Going Commando disc image
vendor/
rerac/ pinned upstream reference checkout (not tracked)
Building
Requires a Rust toolchain via rustup.
cargo check --workspace
cargo test --workspace
The host audio backend is disabled in Cargo.toml (see the comment there) so
that the workspace builds without system ALSA development headers. Audio decode
is the last phase of the port and lives in gc-video; re-enable it and install
alsa-lib-devel when that work starts.
Identifying a disc
python3 tools/identify-disc.py <your-disc.iso>
Reports the serial, version and video mode from SYSTEM.CNF, hashes the boot
executable, and warns when the disc is not the supported build. Reads only a
few megabytes, so it is near-instant.
How it will be verified
Visual and behavioural comparison against PCSX2, replaying recorded input and
comparing frames, level by level. The PS2 float model is reproduced rather than
approximated — see AGENTS.md.
Credits and licensing
This project learns from and is built on the work of others. Licences are
recorded in PROVENANCE.md and notices must travel with any
code derived from them.
- ReRAC — a native Rust/Bevy port of Ratchet & Clank (2002), the first game. ISC. The architecture this project follows.
- OpenRAC / rac2-gc-decomp — matching decompilation research for this game. MIT. Source of verified struct layouts and engine documentation.
- Wrench — community documentation of Insomniac's container formats. GPL, used as a specification reference only; no code is copied.
Ratchet & Clank is a trademark of Sony Interactive Entertainment. This is an unofficial fan project, not affiliated with or endorsed by Sony Interactive Entertainment or Insomniac Games.